The makhṣūṣ is nominative. One common account treats it as a delayed mubtadaʾ whose predicate is the preceding verbal clause; another makes it the predicate of an omitted mubtadaʾ.
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The Syntactic Analysis of Makhṣūṣ
Verbs of Praise and Blame: Niʿma, Ḥabbadhā, Biʾsa, Sāʾa
The makhṣūṣ is nominative. One common account treats it as a delayed mubtadaʾ whose predicate is the preceding verbal clause; another makes it the predicate of an omitted mubtadaʾ.